Magento2 Search Return Not working

Recently I have gone through the 1 issue related to Magento 2.4.1 Search. So the issue was I have upgraded Magento 2.3.5 to 2.4.1. but don`t know somehow the search functionality stopped working.

So I have tried to fix that issue and applied many solutions that are available on the web but have not succeeded with any of the solutions. So after debugging and tons of searches on the web, I got 1 solution. So I have added the solution below.

The Error on logFile

[2020-09-19 17:58:37] main.CRITICAL: {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}],"type":"search_phase_execution_exception","reason":"all shards failed","phase":"query","grouped":true,"failed_shards":[{"shard":0,"index":"magento2_product_1_v2","node":"6KxafAupTSqGYWZUYyULWg","reason":{"type":"illegal_argument_exception","reason":"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}}],"caused_by":{"type":"illegal_argument_exception","reason":"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory.","caused_by":{"type":"illegal_argument_exception","reason":"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory."}}},"status":400} {"exception":"[object] (Elasticsearch\\Common\\Exceptions\\BadRequest400Exception(code: 400): {\"error\":{\"root_cause\":[{\"type\":\"illegal_argument_exception\",\"reason\":\"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory.\"}],\"type\":\"search_phase_execution_exception\",\"reason\":\"all shards failed\",\"phase\":\"query\",\"grouped\":true,\"failed_shards\":[{\"shard\":0,\"index\":\"magento2_product_1_v2\",\"node\":\"6KxafAupTSqGYWZUYyULWg\",\"reason\":{\"type\":\"illegal_argument_exception\",\"reason\":\"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory.\"}}],\"caused_by\":{\"type\":\"illegal_argument_exception\",\"reason\":\"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory.\",\"caused_by\":{\"type\":\"illegal_argument_exception\",\"reason\":\"Text fields are not optimised for operations that require per-document field data like aggregations and sorting, so these operations are disabled by default. Please use a keyword field instead. Alternatively, set fielddata=true on [custom_attribute] in order to load field data by uninverting the inverted index. Note that this can use significant memory.\"}}},\"status\":400} at /magento/vendor/elasticsearch/elasticsearch/src/Elasticsearch/Connections/Connection.php:632)"} []

Solution

First, take database backup & run query to verify records

SELECT * from catalog_eav_attribute WHERE is_filterable_in_search = 1 and attribute_id IN (SELECT attribute_id FROM eav_attribute WHERE entity_type_id IN (SELECT entity_type_id FROM `eav_entity_type` WHERE `entity_type_code` = 'catalog_product') AND (backend_type = 'varchar' OR backend_type = 'text'));

Update the is_filterable_in_search to 0 with below query

UPDATE catalog_eav_attribute SET is_filterable_in_search = 0 WHERE attribute_id IN (SELECT attribute_id FROM eav_attribute WHERE entity_type_id IN (SELECT entity_type_id FROM `eav_entity_type` WHERE `entity_type_code` = 'catalog_product') AND (backend_type = 'varchar' OR backend_type = 'text'));

Enjoy 🎉